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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Inherently biodegradable
Not readily biodegradable

Key value for chemical safety assessment

Biodegradation in water:
inherently biodegradable

Additional information

Inherent biodegradability test was conducted under aerobic conditions according to OECD guidelines 302B/302D.

The results indicate that FR-513 is inherently biodegradable. Under the test conditions ultimate biodegradation of FR-513 at an extent of 77% was attained during a period of 36 days. The deviatons between the replicates were less than 20% and therefore the results were considered valid. The validity of the test was demonstrated by the results of the procedure control where 90% DOC removal was attained in the first week.



Ready biodegradibility test was conducted using OECD guideline 310 and OPPTS guideline 835.3120. The results from biodegradability test indicate that FR-513 is not readily biodegradable, since in the samples containg FR-513 the CO2 produced during 28 days was equivalent to an extent of 2.5% ultimate biodegradation. The test was proven valid since sodium benzoate was mineralized by an average 84% during the first 14 days of the tst and the mean TIC present in the blank control at the end of the test was less than 15% of the organic carbon added initially as the test substance. In addition, FR-513 was not inhibitory to the biomass at the test conditions.